> My understanding of how software is built surpasses any language specifics
do you mean that sure, you don't understand all the language specifics, but that's unimportant because you understand the high level? Or do you mean that you keep track in detail of developments in each of the five languages you've listed (to the level of detail of reading all their release notes and testing every new feature, knowing about the characteristics of all different flavours of index in SQL databases, and knowing best practices for managing state in React components, as suggested in the article)?
If the latter - if you truly have an encyclopaedic knowledge of every tool you use - then, well, congratulations, but I hope you realise that nearly all of us who work with a diverse array of technologies never achieve that mastery.
But if, on the other hand, you're casually conceding that you also don't have the low-level mastery of the tools you use that you would if you worked with only one of them every day, then... maybe you shouldn't be disdaining the author as a failure for failings that you also have?